:root{--primary-color: #3b82f6;--primary-dark: #1e40af;--secondary-color: #64748b;--success-color: #10b981;--warning-color: #f59e0b;--error-color: #ef4444;--info-color: #06b6d4;--sidebar-width: 220px;--sidebar-collapsed-width: 70px;--header-height: 70px;--border-radius: 12px;--box-shadow: 0 4px 25px rgba(0, 0, 0, .06)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background-color:#f8fafc;color:#334155;line-height:1.6}.app-container{display:flex;min-height:100vh}#sidebar{position:fixed;top:0;left:0;height:100vh;width:var(--sidebar-width);background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;transition:all .3s ease;z-index:1000;box-shadow:4px 0 15px #0000001a;overflow-y:auto}#sidebar.collapsed{width:60px}#sidebar.collapsed .sidebar-title,#sidebar.collapsed .nav-text{opacity:0;visibility:hidden}.sidebar-header{padding:1.5rem;border-bottom:1px solid 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